They were demanding the police take immediate action to find out who was responsible for the alleged slaughter of cows.
The government also announced that a road and a college will be named after the inspector who was killed in Monday's mob violence over alleged cow slaughter.
The inspector's sister had alleged earlier that Yogi Adityanath was all about "cows, cows, cows" but was not taking action against the killers.
And the six officers inside the police station had started frantically calling the district headquarters.
The DGP said, "We in the police force are like family". She said that the CM only talks about "cow, cow, cow", while the law and order situation in the state deteriorates. Police have launched an investigation and said post-mortem examinations would be conducted.
Inspector Singh was the investigating officer in the Akhlaq lynching case of Dadri between September 28, 2015, and November 9, 2015.More news: Saudi Arabia works on convincing Russian Federation to join oil cuts
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A statement released by the Uttar Pradesh government late Tuesday night quoted Chief Minister Yogi Adityanath as saying that the incident was "part of a larger conspiracy".
India's Hindu majority regards cows as holy and their slaughter is banned in most Indian states. "The first incident took place in Mahav village of Syana where the cow slaughter happened".
While talking to the Quint, the father of the minor said, "I was taken to the police station where they kept me for nearly four hours". According to the several villagers of Nayabans, apart from the two minors, the remaining five accused were not even present in the village at the time of the incident, according to Scroll.
The second FIR names Raj, 26 others and 50-60 unidentified persons as accused under 17 charges relating to murder, sedition, arson and dacoity for the mob violence and the two deaths. "The police also reached there and we went to the Siana police station for filing our complaint (about cow slaughter)", he says.
The police wanted to calm the villagers down because thousands of Muslims had gathered over the weekend in Bulandshahr for a religious event.
On Monday, a mob of some 400 people, including right-wing activists, violently rampaged through the Chingrawathi village apparently after cow carcasses were found strewn in a jungle nearby. But eyewitnesses, some of whom were watching from the other side of the road, said the violence broke out only after the police fired into the air to try and disperse the crowd. The inspector died before he could be treated.